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02-07 ENGINE WANTED

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So I went to do a top end on my 2002 cr 250 that I got in a trade for my 450. Pulled it apart and I need to rebuild the whole engine it looks like. I am wondering if on a 02 frame that an engine from 02-07 would fit? and would anyone on here happen to have a engine for sale? please let me know! thanks! 

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What exactly needs to be done? I did both bottom and top end on an '03, even had some port, machining and didn't break the bank on it. Is there case damage?

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 If you decide to replace the engine, I will buy the old engine from you as it sits. I'll pay shipping & everything. I'm dead serious. I LOVE taking on projects like that.

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Rebuild yours, is not that hard. I found my crank rusted solid when i bought my bike seized. It was cheaper to rebuild it and i didn't buy a grenade

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As H4 said I do have a complete motor that has less than 4 hrs on new cylinder, piston kit, and main bearings.  Shoot me a text if youre interested.

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I'd also recommend getting the 03 cdi as it had a better map to go with the 03 oem cyl. porting specs for better lowend response vs. the 02..

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